AutoCodes – Generic – B258A

B258A Code - Low Beam Control Circuit

Quick Answer

With the headlamp switch in the ON position, the headlamp switch headlamp ON signal circuit is grounded through the headlamp switch. Common causes include Blown Low Beam Headlamp Fuse, Low Beam Headlamp Fuse harness is open or shorted, Low Beam Headlamp Fuse circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: B258A indicates Low Beam Control Circuit.
Common causes: Common causes include Blown Low Beam Headlamp Fuse, Low Beam Headlamp Fuse harness is open or shorted, Low Beam Headlamp Fuse circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 5,491

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 26, 2023

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B258A Description

With the headlamp switch in the ON position, the headlamp switch headlamp ON signal circuit is grounded through the headlamp switch. The Body Control Module (BCM) responds by applying ground to the low beam relay control circuit which energizes the low beam relay. With the low beam relay energized, the switch contacts close allowing battery voltage to flow through the low beam fuses to the low beam control circuits illuminating the low beam headlamps. The Diagnostic Trouble Code (DTC) will be set when the BCM detects a problem in the headlamp low beam relay control circuit.

OBDII Code B258A - Low Beam Control Circuit - AutoCodes.com — B258A Code - Low Beam Control Circuit

What does this mean?

What are the Possible Causes of the DTC B258A?

Blown Low Beam Headlamp Fuse
Low Beam Headlamp Fuse harness is open or shorted
Low Beam Headlamp Fuse circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B258A?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

B258A:01 Low Beam Control Circuit Short to Battery
B258A:02 Low Beam Control Circuit Short to Ground
B258A:04 Low Beam Control Circuit Open

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B258A code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the B258A code?

Need more information on how to fix the B258A code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B258A code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B258A Buick — Low Beam Control Circuit
B258A Cadillac — Low Beam Control Circuit
B258A Chevrolet — Low Beam Control Circuit
B258A GMC — Low Beam Control Circuit

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B258A Code

1. What are the common symptoms of OBDII code B258A (Low Beam Control Circuit)?

- Common symptoms include malfunctioning low beam headlights or intermittent issues with the low beam headlights turning on.

2. What are the possible causes of OBDII code B258A?

- Possible causes include a faulty headlight control module, issues with the headlight switch, wiring problems, or a malfunctioning light sensor.

3. How can I diagnose the Low Beam Control Circuit issue related to code B258A?

- Diagnosis typically involves checking the headlight control module, inspecting the wiring for any damage or loose connections, and testing the headlight switch and light sensor.

4. Can a DIY enthusiast repair OBDII code B258A at home?

- While some simple wiring checks and inspections can be done at home, diagnosing and repairing the specific cause of the code may require professional expertise and specialized tools.

5. Is it safe to drive with OBDII code B258A triggered?

- It is generally not recommended to drive with malfunctioning low beam headlights, as it can compromise visibility, especially in low light conditions. It's best to address the issue promptly.

6. How much does it typically cost to repair OBDII code B258A?

- The cost of repair can vary depending on the underlying cause of the issue. It's advisable to get a diagnostic assessment from a qualified technician to determine the exact cost.

7. Can resetting the OBDII system clear code B258A permanently?

- Resetting the OBDII system may temporarily clear the code, but if the underlying issue causing the Low Beam Control Circuit problem is not fixed, the code is likely to reappear.

8. Are there any preventive maintenance tips to avoid OBDII code B258A in the future?

- Regularly inspecting the headlights, ensuring proper wiring connections, and promptly addressing any headlight issues can help prevent the recurrence of the Low Beam Control Circuit problem.

9. How long does it usually take to repair OBDII code B258A?

- The repair time can vary depending on the exact cause of the issue and the complexity of the repair. Some cases may be resolved quickly, while others may require more extensive troubleshooting.

10. Can extreme weather conditions affect the triggering of OBDII code B258A?

- Extreme weather conditions, such as heavy rain or snow, can potentially exacerbate existing headlight control issues and lead to the triggering of code B258A.